JPH10226548A - Coal ash sand and its production - Google Patents
Coal ash sand and its productionInfo
- Publication number
- JPH10226548A JPH10226548A JP3363997A JP3363997A JPH10226548A JP H10226548 A JPH10226548 A JP H10226548A JP 3363997 A JP3363997 A JP 3363997A JP 3363997 A JP3363997 A JP 3363997A JP H10226548 A JPH10226548 A JP H10226548A
- Authority
- JP
- Japan
- Prior art keywords
- coal ash
- cement
- weight
- parts
- sand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、土木材料、建築材
料等として利用できる石炭灰砂及びその製造方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coal ash sand which can be used as civil engineering materials, building materials and the like, and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、石炭火力発電所から大量に発生す
る石炭灰を有効利用するために、建築材料等として使用
される砂を石炭灰を原料として人工的に製造する方法が
提案されている。例えば、特開昭６１−１５１０５２号
公報には、石炭灰にセメント及び水を加え、高速混合造
粒して石炭灰砂を製造する方法が開示されている。同様
に、特開昭６３−２０１０４５号公報には、フライアッ
シュとスラグ粉末にセメント及び水を加え、高速混合造
粒して石炭灰砂を製造する方法が開示されている。ま
た、特開平３−２７５１３４号公報には、石炭灰にセメ
ントと集塵ダスト及び水を加えて造粒して土木材料等と
する方法が開示されている。しかしながら、上記の方法
で用いられる石炭灰、セメント、スラグ、集塵ダストの
粉末度はほぼ同等であり、いずれも粒子径は数μｍ〜１
０μｍ程度であることから、これらの粒子間を補完する
微粒子群が少ないため、付着力が小さく、造粒しにくい
という問題があり、しかも得られる砂の造粒強度が小さ
く、表面もざらざらしているという欠点があった。2. Description of the Related Art Conventionally, there has been proposed a method of artificially producing sand used as a building material or the like using coal ash as a raw material in order to effectively utilize a large amount of coal ash generated from a coal-fired power plant. . For example, Japanese Unexamined Patent Publication No. Sho 61-151052 discloses a method of producing coal ash sand by adding cement and water to coal ash and performing high-speed mixing and granulation. Similarly, JP-A-63-201045 discloses a method for producing coal ash sand by adding cement and water to fly ash and slag powder, and performing high-speed mixing and granulation. In addition, Japanese Patent Application Laid-Open No. 3-275134 discloses a method in which cement, dust collection dust, and water are added to coal ash and granulated to obtain a civil engineering material. However, the fineness of the coal ash, cement, slag, and dust collected used in the above method is almost the same, and the particle diameter of each is several μm to 1 μm.
Since it is about 0 μm, there is a small number of fine particles that complement the space between these particles, so that there is a problem that adhesion force is small and granulation is difficult, and the granulation strength of the obtained sand is small and the surface is rough. There was a disadvantage that there is.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、石炭
灰及びセメントの粒子間に平均粒子径が０．５μｍ以下
である無機質微粒子を充填することにより、造粒粒子の
強度が高く、かつ球状で良好な石炭灰砂を提供すること
にある。SUMMARY OF THE INVENTION An object of the present invention is to fill inorganic fine particles having an average particle diameter of 0.5 μm or less between particles of coal ash and cement to increase the strength of granulated particles, and It is to provide spherical and good coal ash.
【０００４】[0004]
【課題を解決するための手段】本発明は、石炭灰、セメ
ント及び平均粒子径が０．５μｍ以下である無機質微粒
子から構成されてなることを特徴とする石炭灰砂に関す
るものである。また、本発明は、石炭灰及びセメント
に、ＢＥＴ比表面積が５ｍ2 ／ｇ以上である無機質粉体
のスラリーを添加混合した後、高速攪拌造粒することを
特徴とする石炭灰砂の製造方法に関するものである。SUMMARY OF THE INVENTION The present invention relates to a coal ash sand comprising coal ash, cement and inorganic fine particles having an average particle diameter of 0.5 μm or less. The present invention also provides a method for producing coal ash sand, comprising adding and mixing a slurry of an inorganic powder having a BET specific surface area of 5 m 2 / g or more to coal ash and cement, followed by high-speed stirring granulation. It is about.
【０００５】本発明の石炭灰砂は、石炭灰、セメント及
び平均粒子径が０．５μｍ以下である無機質微粒子から
構成されてなる。各構成成分の割合は、６０〜９０重量
部、好ましくは、６０〜８５重量部、セメント２〜２５
重量部、好ましくは、５〜２０重量部、及び無機質微粒
子５〜３５重量部、好ましくは、１０〜３０重量部であ
ることが望ましい。[0005] The coal ash sand of the present invention is composed of coal ash, cement and inorganic fine particles having an average particle diameter of 0.5 µm or less. The proportion of each component is 60 to 90 parts by weight, preferably 60 to 85 parts by weight, and cement 2 to 25 parts by weight.
It is desirable that the amount is 5 parts by weight, preferably 5 to 20 parts by weight, and 5 to 35 parts by weight, preferably 10 to 30 parts by weight of inorganic fine particles.
【０００６】石炭灰が６０重量部よりも少ないと、石炭
灰の有効利用量が減少するので好ましくない。また、９
０重量部よりも多くなると、得られる石炭灰砂の強度が
小さくなるため好ましくない。セメントが２重量部より
も少ないと、得られる石炭灰砂の強度が小さくなるため
好ましくない。また、２５重量部よりも多くなると、石
炭灰砂の製造コストが高くなるので好ましくない。[0006] If the amount of coal ash is less than 60 parts by weight, the effective utilization amount of coal ash is undesirably reduced. Also, 9
If the amount is more than 0 parts by weight, the strength of the coal ash sand obtained is undesirably low. If the cement content is less than 2 parts by weight, the strength of the coal ash sand obtained is undesirably low. On the other hand, if the amount is more than 25 parts by weight, the production cost of coal ash becomes undesirably high.
【０００７】無機質微粒子が５重量部よりも少ないと、
石炭灰とセメントの粒子間の間隙を十分充填することが
できなくなるので好ましくない。また、３５重量部より
も多くなると石炭灰とセメントの粒子間の間隙からはみ
出してかえって強度が低下する原因となるので好ましく
ない。無機質微粒子の平均粒子径は０．５μｍ以下、好
ましくは、０．１μｍ以下である。平均粒子径が０．５
μｍよりも大きくなると、石炭灰及びセメントの粒子と
同等の大きさとなり、これら粒子間の間隙を充填するこ
とができなくなるので好ましくない。無機質微粒子とし
ては、工場排水処理後の残さ、天然の粘土等が挙げられ
る。If the amount of the inorganic fine particles is less than 5 parts by weight,
It is not preferable because the gap between the coal ash and the cement particles cannot be sufficiently filled. On the other hand, if it exceeds 35 parts by weight, it is not preferable because it protrudes from the gap between the coal ash and the cement particles and causes the strength to decrease. The average particle diameter of the inorganic fine particles is 0.5 μm or less, preferably 0.1 μm or less. Average particle size 0.5
If the particle size is larger than μm, the particle size becomes equivalent to that of coal ash and cement particles, and it becomes impossible to fill gaps between these particles, which is not preferable. Examples of the inorganic fine particles include residues after treatment of factory wastewater and natural clay.
【０００８】本発明の石炭灰は、石炭灰及びセメント
に、ＢＥＴ比表面積が５ｍ2 ／ｇ以上である無機質粉体
のスラリーを添加混合した後、高速攪拌造粒することに
より得られる。各成分の配合割合は、石炭灰６０〜９０
重量部、好ましくは、６０〜８５重量部、セメント２〜
２５重量部、好ましくは、５〜２０重量部、及び無機質
粉体５〜３５重量部、好ましくは、１０〜３０重量部で
あることが望ましい。無機質粉体のＢＥＴ比表面積は、
５ｍ2 ／ｇ以上、好ましくは、１０ｍ2 ／ｇ以上であ
る。ＢＥＴ比表面積が５ｍ2 ／ｇよりも小さくなると、
石炭灰及びセメントの粒子と同等の大きさとなり、これ
ら粒子間の間隙を充填することができなくなるので好ま
しくない。The coal ash of the present invention is obtained by adding and mixing a slurry of an inorganic powder having a BET specific surface area of 5 m 2 / g or more to coal ash and cement, followed by high-speed stirring granulation. The blending ratio of each component is coal ash 60 to 90
Parts by weight, preferably 60 to 85 parts by weight, cement 2
It is desirable that the amount is 25 parts by weight, preferably 5 to 20 parts by weight, and 5 to 35 parts by weight, preferably 10 to 30 parts by weight of the inorganic powder. The BET specific surface area of the inorganic powder is
It is at least 5 m 2 / g, preferably at least 10 m 2 / g. When the BET specific surface area becomes smaller than 5 m 2 / g,
It is not preferable because the size becomes the same as that of the particles of coal ash and cement, and it becomes impossible to fill the gap between these particles.
【０００９】また、本発明においては、無機質粉体のス
ラリーは、０．１〜１ｍｍの範囲の二次粒子を含有する
ことが望ましい。これらの二次粒子は、造粒核となって
造粒を促進させることができる。０．１〜１ｍｍの範囲
の二次粒子の割合は、１〜１０重量％であることが好ま
しい。二次粒子の割合が、１重量％よりも少ないと、造
粒を促進する効果がなく、また、１０重量％よりも多く
なると、石炭灰とセメントの粒子間の間隙を充填する無
機質微粒子群が少なくなるので好ましくない。In the present invention, it is desirable that the slurry of the inorganic powder contains secondary particles in a range of 0.1 to 1 mm. These secondary particles can serve as granulation nuclei to promote granulation. The ratio of the secondary particles in the range of 0.1 to 1 mm is preferably 1 to 10% by weight. When the ratio of the secondary particles is less than 1% by weight, there is no effect of promoting the granulation, and when the ratio is more than 10% by weight, the inorganic fine particles that fill the gaps between the coal ash and cement particles are not formed. It is not preferable because it becomes less.
【００１０】高速攪拌造粒するための造粒機としては、
アイリッヒ型やヘンシェル型等のバッチ方式のものや、
ブレンダー型やピン型等の連続方式のものが用いられ
る。造粒に用いる石炭灰、セメント及び無機質粉体に加
えられる水分量は、それら粉体の粉末度などにより異な
るが、全粉体量１００重量部に対して２５〜４０重量部
が好ましい。As a granulator for high-speed stirring granulation,
Batch type such as Erich-type or Henschel type,
A continuous type such as a blender type or a pin type is used. The amount of water added to the coal ash, cement and inorganic powder used for granulation varies depending on the fineness of the powder, but is preferably 25 to 40 parts by weight based on 100 parts by weight of the total powder.
【００１１】[0011]
【発明の効果】本発明の石炭灰砂は、粒子径０．５μｍ
以下の無機質微粒子が、石炭灰及びセメントの粒子間に
充填にされているので、造粒粒子の強度が高く、かつ球
状で良好である。また、本発明によれば、石炭灰砂を製
造するに際し、無機質粉体のスラリーに、０．１〜１ｍ
ｍの範囲の二次粒子を含有させることにより、これらの
二次粒子が造粒核となって造粒を促進させることができ
る。The coal ash sand of the present invention has a particle diameter of 0.5 μm.
Since the following inorganic fine particles are filled between the particles of coal ash and cement, the strength of the granulated particles is high, and the granulated particles are good in shape. Further, according to the present invention, when producing coal ash sand, 0.1 to 1 m
By containing the secondary particles in the range of m, these secondary particles can serve as granulation nuclei to promote granulation.
【００１２】[0012]
【実施例】以下に実施例及び比較例を示す。 実施例１〜５ 表１に記載の無機質粉体をステンレスボール（容積５
ｌ）に移し、これにスラリー濃度が約５０％になるよう
に水を加えた。このボールをセメントモルタルミキサー
（丸車製，Ｃ１３８Ａ型）にセットして低速（回転運動
１４０ｒｐｍ、遊星運動６２ｒｐｍ）で１分間混合し
た。これに残りの水を加えて、高速（回転運動２８５ｒ
ｐｍ、遊星運動１２５ｒｐｍ）で３分間混合した。この
際の無機質粉体の０．１〜１ｍｍの範囲の二次粒子の割
合は５重量％であった。得られた無機質粉体スラリーに
表１に記載の石炭灰及びセメントを加え、低速で２分間
混練した。なお、石炭灰として微粉炭灰フライアッシ
ュ、セメントとして普通セメントを用いた。次いで、高
速で混練して造粒状態を観察しながら造粒を行った。得
られた造粒物をバットに移し、室内に所定日数放置した
後、水中浸漬試験と木屋式硬度計による造粒物の圧潰強
さ試験を行った。結果を表１に示す。EXAMPLES Examples and comparative examples are shown below. Examples 1 to 5 Inorganic powders shown in Table 1 were placed in stainless steel balls (volume 5).
1), and water was added to the slurry so that the slurry concentration was about 50%. The balls were set in a cement mortar mixer (C138A, manufactured by Round Wheel) and mixed at low speed (rotational motion: 140 rpm, planetary motion: 62 rpm) for 1 minute. The remaining water is added to this, and high speed (rotational motion 285r
pm, planetary motion 125 rpm) for 3 minutes. At this time, the ratio of the secondary particles in the range of 0.1 to 1 mm in the inorganic powder was 5% by weight. The coal ash and cement described in Table 1 were added to the obtained inorganic powder slurry, and kneaded at a low speed for 2 minutes. Fine coal ash fly ash was used as coal ash, and ordinary cement was used as cement. Next, the mixture was kneaded at a high speed to perform granulation while observing the granulation state. The obtained granules were transferred to a vat, left in a room for a predetermined number of days, and then subjected to an underwater immersion test and a crushing strength test of the granules using a Kiya hardness meter. Table 1 shows the results.
【００１３】実施例６ 表１に記載の無機質粉体をステンレスボール（容積５
ｌ）に移し、これにスラリー濃度が約５０％になるよう
に水を加えた。このボールをセメントモルタルミキサー
（丸車製，Ｃ１３８Ａ型）にセットして低速（回転運動
１４０ｒｐｍ、遊星運動６２ｒｐｍ）で１分間混合し
た。これに残りの水を加えて、高速（回転運動２８５ｒ
ｐｍ、遊星運動１２５ｒｐｍ）で５分間混合した。この
際の無機質粉体の０．１〜１ｍｍの範囲の二次粒子の割
合は１重量％未満であった。次いで、実施例１〜５と同
様にして造粒物を製造した。結果を表１に示す。Example 6 A stainless steel ball (volume 5
1), and water was added to the slurry so that the slurry concentration was about 50%. The balls were set in a cement mortar mixer (C138A, manufactured by Round Wheel) and mixed at low speed (rotational motion: 140 rpm, planetary motion: 62 rpm) for 1 minute. The remaining water is added to this, and high speed (rotational motion 285r
pm, planetary motion 125 rpm) for 5 minutes. At this time, the ratio of the secondary particles in the range of 0.1 to 1 mm of the inorganic powder was less than 1% by weight. Next, a granulated product was produced in the same manner as in Examples 1 to 5. Table 1 shows the results.
【００１４】比較例１〜２ 表１に記載の石炭灰及びセメントに水を加え、セメント
モルタルミキサー（丸車製，Ｃ１３８Ａ型）にセットし
て低速で２分間混練した。次いで、高速で混練して造粒
状態を観察しながら造粒を行った。得られた造粒物をバ
ットに移し、室内に所定日数放置した後、水中浸漬試験
と木屋式硬度計による造粒物の圧潰強さ試験を行った。
結果を表１に示す。Comparative Examples 1 and 2 Water was added to the coal ash and cement described in Table 1, and the mixture was set in a cement mortar mixer (C138A, manufactured by Maru Wheel) and kneaded at a low speed for 2 minutes. Next, the mixture was kneaded at a high speed to perform granulation while observing the granulation state. The obtained granules were transferred to a vat, left in a room for a predetermined number of days, and then subjected to an underwater immersion test and a crushing strength test of the granules using a Kiya hardness meter.
Table 1 shows the results.
【００１５】[0015]
【表１】 [Table 1]
Claims (8)
５μｍ以下である無機質微粒子から構成されてなること
を特徴とする石炭灰砂。Claims: 1. Coal ash, cement and an average particle size of 0.1.
Coal ash sand comprising inorganic fine particles of 5 μm or less.
２５重量部及び無機質微粒子５〜３５重量部から構成さ
れてなることを特徴とする請求項１記載の石炭灰砂。2. 60 to 90 parts by weight of coal ash, 2 to cement
The coal ash sand according to claim 1, comprising 25 parts by weight and 5 to 35 parts by weight of inorganic fine particles.
又は天然の粘土である請求項１記載の石炭灰砂。3. The coal ash sand according to claim 1, wherein the inorganic fine particles are residues after treatment of industrial wastewater or natural clay.
が５ｍ2 ／ｇ以上である無機質粉体のスラリーを添加混
合した後、高速攪拌造粒することを特徴とする石炭灰砂
の製造方法。4. A method for producing coal ash sand, comprising adding and mixing a slurry of an inorganic powder having a BET specific surface area of 5 m 2 / g or more to coal ash and cement, followed by high-speed stirring granulation.
２５重量部及び無機質粉体５〜３５重量部である請求項
４記載の石炭灰砂の製造方法。5. 60 to 90 parts by weight of coal ash, 2 to cement
The method for producing coal ash according to claim 4, wherein the amount is 25 parts by weight and 5 to 35 parts by weight of the inorganic powder.
は天然の粘土である請求項４記載の石炭灰砂の製造方
法。6. The method for producing coal ash sand according to claim 4, wherein the inorganic powder is a residue after factory wastewater treatment or a natural clay.
ｍの範囲の二次粒子を含むことを特徴とする請求項４記
載の石炭灰砂の製造方法。7. The slurry of the inorganic powder has a thickness of 0.1 to 1 m.
The method for producing coal ash sand according to claim 4, comprising secondary particles in a range of m.
次粒子の割合が１〜１０重量％である請求項７記載の石
炭灰砂の製造方法。8. The method for producing coal ash according to claim 7, wherein the proportion of the secondary particles in the range of 0.1 to 1 mm of the inorganic powder is 1 to 10% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3363997A JP3663808B2 (en) | 1997-02-18 | 1997-02-18 | Coal ash sand and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3363997A JP3663808B2 (en) | 1997-02-18 | 1997-02-18 | Coal ash sand and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10226548A true JPH10226548A (en) | 1998-08-25 |
| JP3663808B2 JP3663808B2 (en) | 2005-06-22 |
Family
ID=12392031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3363997A Expired - Lifetime JP3663808B2 (en) | 1997-02-18 | 1997-02-18 | Coal ash sand and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3663808B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002059148A (en) * | 2000-08-21 | 2002-02-26 | Taiheiyo Cement Corp | Coal ash treatment/distribution combination system |
| JP2005169379A (en) * | 2003-11-17 | 2005-06-30 | Shikoku Electric Power Co Inc | Pelletizer, producing method of ground material using the pelletizer, ground material obtained by the producing method and recycling method of the ground material |
-
1997
- 1997-02-18 JP JP3363997A patent/JP3663808B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002059148A (en) * | 2000-08-21 | 2002-02-26 | Taiheiyo Cement Corp | Coal ash treatment/distribution combination system |
| JP2005169379A (en) * | 2003-11-17 | 2005-06-30 | Shikoku Electric Power Co Inc | Pelletizer, producing method of ground material using the pelletizer, ground material obtained by the producing method and recycling method of the ground material |
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| JP3663808B2 (en) | 2005-06-22 |
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